How to easily convert an unsigned string to a string?

2018-07-04 17:37:00

I define an unsigned string as a string containing unsigned chars:

namespace std
{
   typedef basic_string<unsigned char> ustring;
}

Thus, given a basic std::string whose chars range from -128 to 127, how can I easily convert it to a std::ustring whose chars range from 0 to 255?

你可以使用迭代器构造函数：

ustring to_ustring(const std::string& s)
{
    return {s.begin(), s.end()};
}

You do:

using ustring = std::vector<unsigned char>;
std::string a("abc");
ustring b(a.begin(), a.end());

Note that the zero-terminator is not copied.

basic_string<unsigned char> would require specializing char_traits . And no new names can be added to namespace std .

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